CN218005140U - Battery pack - Google Patents

Abstract

The utility model provides a battery pack, include: the tray comprises a bottom plate and a plurality of boundary beams arranged on the periphery of the bottom plate, and the bottom plate and the boundary beams are enclosed to form an accommodating groove; the battery cell is positioned in the accommodating groove, and an assembling gap is formed between the battery cell and the boundary beam; the buffer piece is arranged in the assembly gap, and the compression amount of the buffer piece is adjustable along the direction from the edge beam to the accommodating groove; the buffer part can be switched between a first state and a second state, the compression amount of the buffer part is a first compression amount when the buffer part is in the first state, the compression amount of the buffer part is a second compression amount when the buffer part is in the second state, and the first compression amount is larger than the second compression amount; and the insulating support plate is arranged in the assembly gap and is positioned between the battery cell and the buffer piece. The utility model discloses a bolster can be injectd the position of electric core, and the utility model discloses a bolster can also retrain electric core after the clearance of electric core and tray forms.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field, more specifically relates to a battery package.

Background

When the tray is gone into to the electric core of prior art, especially to no module battery package scheme, because the existence of electric core dimensional tolerance, electric core stack tolerance, tray dimensional tolerance, and electric core income tray technology restriction, certain clearance must be reserved with the tray inner wall in the design to electric core, just can guarantee that electric core packs into the tray smoothly, and plastic insulation board or backup pad are pasted to the big face of outside electric core, play protection electric core, direction and fill clearance effect.

Because actual clearance tolerance is very big, the thickness of backup pad can only be designed according to clearance tolerance down to avoid the unable clearance of packing into of electric core, this backup pad that just leads to installing under most circumstances can't fill the clearance between electric core and the tray inner wall completely, and electric core large face supports inadequately. When the battery cell expands during charging, the backup pad can not limit the expansion of the battery cell at the outermost side, so that the following problems are caused at least:

(1) Affecting the charge-discharge cycle life of the cell.

(2) Along with the increase of cycle number, electric core bulging force is bigger and bigger, and the shearing force that upper and lower adhesive layer bore is bigger and bigger, has the inefficacy risk.

After experiencing long-term severe working conditions, once the adhesion fails, the battery core is lack of constraint, the internal structure of the battery pack can be damaged, and safety risks exist.

In addition, in the conventional battery pack, after a certain period of time, or when it is difficult to fill all gaps in the support plate, a new gap is generated between the battery cell and the tray, or a residual gap is formed, and the safety of the battery cell is lowered due to the existence of the gap.

SUMMERY OF THE UTILITY MODEL

The utility model provides a new technical scheme of battery package can solve the technical problem that the clearance that produces between electric core and the tray in the background art or the electric core security that the surplus clearance that forms through the backup pad leads to reduces.

The utility model provides a battery pack, include: the tray comprises a bottom plate and a plurality of boundary beams arranged on the periphery of the bottom plate, and the bottom plate and the boundary beams are enclosed to form an accommodating groove; the battery cell is positioned in the accommodating groove, and an assembling gap is formed between the battery cell and the edge beam; the buffer piece is arranged in the assembling gap, and the compression amount of the buffer piece is adjustable along the direction from the edge beam to the accommodating groove; the buffer piece is switchable between a first state and a second state, the compression amount of the buffer piece is a first compression amount when the buffer piece is in the first state, the compression amount of the buffer piece is a second compression amount when the buffer piece is in the second state, and the first compression amount is larger than the second compression amount; and the insulating support plate is arranged in the assembly gap and is positioned between the battery cell and the buffer parts.

Optionally, the buffer comprises: the packaging structure comprises a packaging layer, a containing space is limited in the packaging layer, the packaging layer is switched between a closed state and an open state, when the packaging layer is in the closed state, the pressure in the containing space is first pressure, when the packaging layer is in the open state, the pressure in the containing space is second pressure, and the first pressure is smaller than the second pressure; the elastic body is arranged in the accommodating space, and the compression amount of the elastic body is adjustable along the direction from the edge beam to the accommodating groove.

Optionally, the resilient body defines a plurality of open pores communicating with the outside.

Optionally, the elastomer is foam.

Optionally, the receiving groove has an open end, and when the encapsulation layer is in the open state, the encapsulation layer has an opening close to the open end of the receiving groove.

Optionally, the first pressure is a vacuum pressure and the second pressure is an atmospheric pressure.

Optionally, at least one side of the insulating support plate is coated with an adhesive.

Optionally, the bumper is connected to the edge beam.

Optionally, the buffer member is a plate-shaped member, and a thickness direction of the buffer member is along a direction from the edge beam to the receiving groove.

Optionally, the battery cell has a first outer side surface and a second outer side surface, the area of the first outer side surface is smaller than the area of the second outer side surface, the first outer side surface is connected with the bottom plate, and the second outer side surface is abutted to the insulating support plate.

According to the utility model discloses a battery pack, the utility model discloses can realize to the packing in clearance between electric core and the boundary beam and to the restraint of electric core through the bolster. Because the buffer piece has larger compression amount before being installed in the assembly gap, the thickness of the buffer piece can be reduced, the installation of the buffer piece is convenient, and the buffer piece can be suitable for smaller assembly gaps and uneven gaps. And the utility model discloses a bolster can also use after electric core and tray form the clearance, has guaranteed the security performance of electric core.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a partial exploded view of a battery pack according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a buffer of an embodiment of the present invention before compression.

Fig. 3 is a cross-sectional view of a buffer of an embodiment of the present invention after compression;

fig. 4 is an assembly diagram of the tray, the battery cell and the insulating support plate according to an embodiment of the present invention;

fig. 5 is a schematic view of the buffer member in a first state after the tray, the battery cell, the insulating support plate and the buffer member according to the embodiment of the present invention are assembled;

fig. 6 is a schematic diagram of the buffer member in the second state after the tray, the battery cell and the buffer member are assembled according to the embodiment of the present invention.

Reference numerals

The battery pack 100:

atray 10; ahousing groove 11; abase plate 12; anedge beam 13; acavity 14; a reinforcingrib 15;

anencapsulation layer 20; asealing edge 21;

anelastic body 30; afirst side face 31; asecond side 32;

aninsulating support plate 40;

and abattery cell 50.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The following describes thebattery pack 100 according to an embodiment of the present invention with reference to the drawings.

The utility model disclosesbattery package 100 includestray 10,electric core 50, bolster andinsulating backup pad 40.

Specifically, thetray 10 includes abottom plate 12 and a plurality ofboundary beams 13 disposed on the periphery of thebottom plate 12, thebottom plate 12 and the plurality ofboundary beams 13 enclose and form theaccommodating groove 11, thebattery cell 50 is located in theaccommodating groove 11, and an assembling gap is formed between the battery cell and theboundary beams 13, the buffer member is mounted in the assembling gap, and the compression amount of the buffer member is adjustable along the direction from theboundary beams 13 to theaccommodating groove 11. The buffer member is switchable between a first state and a second state, when the buffer member is in the first state, the compression amount of the buffer member is a first compression amount, when the buffer member is in the second state, the compression amount of the buffer member is a second compression amount, the first compression amount is greater than the second compression amount, and theinsulating support plate 40 is arranged in the assembly gap and located between thebattery cell 50 and the buffer member.

In other words, according to the utility model disclosesbattery package 100 mainly comprisestray 10,electric core 50, bolster andinsulating backup pad 40, and whereintray 10 mainly comprisesbottom plate 12 and locates the peripheral a plurality ofboundary beams 13 ofbottom plate 12, can enclosesynthetic holding tank 11 that has the effect of holding throughbottom plate 12 and a plurality ofboundary beams 13, can assembleelectric core 50 inholding tank 11 when assemblingbattery package 100.

Since the cushion itself can be switched between the first state and the second state, the amount of compression of the cushion in the first state is greater than the amount of compression of the cushion in the second state in the outside-in direction. That is, when not assembled to thetray 10, the buffer member is compressed by a large amount, expanded by a small amount, and has a small thickness, facilitating assembly. The cushioning member may protect a greater degree of compression when fitted into thetray 10 and still in the first state. After being assembled to thetray 10, the buffer member may be driven to switch from the first state to the second state, and the compression amount of the buffer member becomes small and the expansion degree becomes large, so that an acting force can be applied to thebattery cell 50.

In addition, aninsulating support plate 40 is provided in the assembly gap, and theinsulating support plate 40 is located between thebattery cell 50 and the buffer member, for example, thebattery cell 50, theinsulating support plate 40, the buffer member, and theedge beam 13 in sequence from inside to outside. Optionally, theinsulating support plate 40 is a plastic plate. Through setting up insulatingbackup pad 40 not only can realize the indirect insulated connection ofelectric core 50 and buffer, can also improve the homogeneity of the buffer toelectric core 50's extrusion force.

Therefore, the utility model discloses can realize the packing to clearance betweenelectric core 50 and theboundary beam 13 and to the restraint ofelectric core 50 through the bolster. Because the buffer piece has larger compression amount before being installed in the assembly gap, the thickness of the buffer piece can be reduced, the installation of the buffer piece is convenient, and the buffer piece can be suitable for smaller assembly gaps and uneven gaps. And the utility model discloses a bolster can also use afterelectric core 50 and tray 10 form the clearance, has guaranteedelectric core 50's security performance.

According to the utility model discloses an embodiment, the bolster includes encapsulatedlayer 20 andelastomer 30, be injectd in the encapsulatedlayer 20 and have accommodating space, encapsulatedlayer 20 switches between closed condition and open mode, when encapsulatedlayer 20 is in closed condition, pressure in the accommodating space is first pressure, when encapsulatedlayer 20 is in open mode, pressure in the accommodating space is the second pressure, first pressure is less than the second pressure, accommodating space is located toelastomer 30, and along the direction fromboundary beam 13 to holdingtank 11,elastomer 30's compressive capacity is adjustable.

That is to say, the buffer member mainly includes thepackaging layer 20 and theelastic body 30, thepackaging layer 20 wraps the periphery of theelastic body 30, thepackaging layer 20 and theelastic body 30 are located in theaccommodating groove 11 together, an accommodating space is defined by thepackaging layer 20, theelastic body 30 is accommodated in the accommodating space, and theelastic body 30 may be made of silicone foam or the like. When theencapsulation layer 20 is in the closed state, the pressure in the receiving space is the first pressure, and when theencapsulation layer 20 is in the open state, the pressure in the receiving space may be the second pressure. That is to say, during assembly, thesealing layer 20 in a closed state and theelastic body 30 in a large compression amount may be firstly installed into theaccommodating groove 11, and then the sealingedge 21 may open thesealing layer 20 to release or expand theelastic body 30, so that the buffer is expanded toward thebattery cell 50 to extrude thebattery cell 50. It should be noted that theencapsulation layer 20 is in the closed state, which is not limited to be completely closed in the embodiment, compared with the open state.

In the outward-inward direction, theelastic body 30 may have afirst side surface 31 and asecond side surface 32, respectively, where thefirst side surface 31 is adjacent to thebattery cell 50, and thesecond side surface 32 is adjacent to theedge beam 13. When the buffer member is in the first state, that is, the compression amount of the buffer member is large, the distance between thefirst side surface 31 and thesecond side surface 32 is S1. When the buffer is in the second state, theelastic body 30 is released, the distance between thefirst side surface 31 and thesecond side surface 32 is S2, and S1 is less than S2.

According to an embodiment of the present invention, theelastic body 30 defines a plurality of open holes communicating with the outside. That is, when thesealing layer 20 is in the open state, the external air can enter the housing space through the opening and enter the open hole, thereby expanding theelastic body 30. Alternatively, theelastic body 30 is foam or the like having a plurality of open pores therein, is easily compressed in theencapsulation layer 20, and is easily expanded upon contact with air. When theelastic body 30 is foam, the foam in the first state may be vacuum compressed foam.

In some embodiments of the present invention, theelastic body 30 is a foam having a plurality of open holes for facilitating compression and release.

According to an embodiment of the present invention, theaccommodating groove 11 has an open end, and when theencapsulating layer 20 is in an open state, the encapsulatinglayer 20 has an opening close to the open end of theaccommodating groove 11. That is, the opening of theencapsulation layer 20 may be opened through the opening, which has an advantage of easy handling.

In some embodiments of the present invention, the first pressure is vacuum pressure and the second pressure is atmospheric pressure. That is, thesealing layer 20 may be evacuated in advance to increase the compression amount of theelastic body 30 and reduce the thickness of the buffer layer.

According to the utility model discloses an embodiment, the coating of at least one side of insulatingbackup pad 40 has the gluing agent, can be after the coating of at least one side of the thickness direction with insulatingbackup pad 40 has glue, then the assembly, can improve the fastness after treating the glue solidification.

In some embodiments of the present application, the buffering member is connected to theedge beam 13, that is, the buffering member loaded into thetray 10 and in the second state may abut against the insulatingsupport plate 40 and theedge beam 13, respectively.

According to the utility model discloses an embodiment, the bolster is the plate-shaped spare, and the thickness direction of bolster is along the direction fromboundary beam 13 to holdingtank 11, is convenient for provide even binding power toelectric core 50 through insulatingbackup pad 40. The insulatingsupport plate 40 can also be a plate-shaped member parallel to the buffer member, so that the uniformity of stress is improved.

In some embodiments of the present invention, thebattery cell 50 has a first outer side surface and a second outer side surface, the area of the first outer side surface is smaller than the area of the second outer side surface, the first outer side surface is connected to thebottom plate 12, and the second outer side surface abuts against the insulatingsupport plate 40. That is, thebattery cell 50 has a large surface and a small surface, and the small surface is attached to thebottom plate 12, and the large surface faces theedge beam 13, wherebymore battery cells 50 can be attached to theaccommodation groove 11. Through making big face and insulatingbackup pad 40 direct or indirect butt, realize spacing toelectric core 50, improveelectric core 50's atress homogeneity.

The utility model discloses an among some concrete modes, be injectd the cavity in theboundary beam 13,boundary beam 13 is equipped with strengtheningrib 15 in order to separate the cavity for a plurality ofcavitys 14, can promote the fastness and the reliability ofboundary beam 13 through adopting strengtheningrib 15, realizes anti extrusion effect.

From this, according to the utility model discloses abattery package 100 has improvedelectric core 50's installation stability and fastness, can be applicable toblade electricity core 50's nomodule battery package 100 scheme (CTP).

The assembly process of thebattery pack 100 according to the present invention will be described in detail with reference to a specific embodiment.

The gap is filled with a vacuum compression plate (buffer) which is vacuum-compressed in advance with foam (elastic body 30) and vacuum-sealed with a thin PET film (packaging layer 20) to achieve good insulation. The manufactured vacuum compression foam can be directly placed in the gap without hard extrusion. After the foam is placed in the vacuum chamber, the vacuum is released, and the foam is filled instantly after rebounding, so that the vacuum chamber has the advantages of low cost, no need of hard extrusion, and suitability for small gaps.

In summary, the present invention provides abattery pack 100, and particularly, a module-free battery pack 100 scheme (CTP) that can be applied to a bladeelectrical core 50, including designing a method for restraining theelectrical core 50 and abattery pack 100 with the restraint.

The interior of thebattery pack 100 may be designed into one ormore battery cell 50 placement cavities as required. The utility model discloses in realize the packing in clearance betweenelectric core 50 and thetray 10 and to the restraint ofelectric core 50 through the vacuum compression board (bolster) of design. The vacuum compression plate is composed of a sealed bag (envelope layer 20) and a foamed elastic material (elastic body 30). The foam elastic material in the sealing bag can be in a natural state, i.e. a non-compressed state, after vacuum compression by a vacuum pumping device, the foam elastic material in the sealing bag is in a compressed state, such as 70% or 80% of compression amount, and the pressure in the maximum compression amount state is about 1 standard atmospheric pressure, and at this time, the sealing bag is in a high vacuum state. The material of the sealing bag can be PE, PO, PP, aluminum plastic film and the like, and the foam elastic material can be silica gel foam, similar materials and the like.

The compression amount of the middle vacuum compression plate of the utility model can be selected but not limited to the maximum compression amount (about 10-5Pa high vacuum state). The thickness at the maximum compression state can be determined by selecting the thickness at the initial state, selecting a vacuum compression plate with a reasonable thickness to fill the gap between thecell 50 and thetray 10, then cutting the sealing edge, releasing the vacuum state, and the foam elastic material in the compression plate expands and completely fills the gap to support and restrain thecell 50.

Whenbattery cell 50 expands, the foam elastic material in the compression plate is compressed, and according to the compressive stress strain curve of the material, the compressive stress of the compression plate rises, and the restraining force reacting onbattery cell 50 also increases, so that when the restraining force increases to exceed the expansion force ofbattery cell 50, the expansion ofbattery cell 50 can be limited, and the effect of protectingbattery cell 50 to prolong the service life is further achieved. The utility model provides abattery package 100 has increased the vacuum compression board betweenelectric core 50 andtray 10 inner wall, has filled the clearance betweenelectric core 50 and thetray 10 to play the support constraint effect toelectric core 50.

The constraint method is generally implemented by determining the specification of a vacuum compression plate according to the size of thebattery cell 50 and the size of the gap after the gap between thebattery cell 50 and thetray 10 is generated, and cutting off a sealing edge after the vacuum compression plate is installed, so as to complete the constraint on thebattery cell 50, thereby forming thebattery pack 100 with the constraint force on thebattery cell 50.

The utility model discloses abattery cell 50 restraint method, this method mainly usedbattery cell 50 and the contact relation between the 100trays 10 of battery package. In the method, a vacuum compression plate is designed to fill the gap between thebattery cell 50 and the inner wall of thetray 10 after the battery cell is inserted into thetray 10, and the filling support effect in the uneven gap can be realized through the elasticity of the material in the compression plate. The compression elasticity, namely the supporting force for thebattery cell 50, of different degrees can be realized through the compression of different degrees; in the existing design, a gap is formed between thebattery cell 50 at the outer side and the inner wall of thetray 10, and the large surface of thebattery cell 50 is not restrained or supported; existing similar constraint methods exist only in modules.

In thebattery pack 100 of the present invention, theoutermost battery cell 50 is constrained at thetray 10 side; there is no core 50 constraint in the existingbattery pack 100 design.

Because the utility model provides a but vacuum compression board selective insulation material fills back in the clearance ofelectric core 50 andtray 10 inner wall, not only plays support and restriction effect, also has insulating effect. The insulatingsupport plate 40 outside theoutermost cell 50 in the original design can be eliminated. In the prior art, the insulation board adhered to the large surface of theouter battery cell 50 plays roles of protecting thebattery cell 50 and guiding when thebattery cell 50 enters thetray 10, and simultaneously, the insulation board partially fills the gap between thebattery cell 50 and the inner wall of thetray 10, so that the insulation board cannot be eliminated.

The utility model discloses abattery package 100 has following advantage at least:

(1) Vacuum compression plate adaptable to non-uniform gap

Tray 10 in-process is put into toelectric core 50, and the clearance size betweenelectric core 50 and thetray 10 inner wall hardly guarantees evenly unanimously, the utility model discloses a vacuum compression board all has certain elasticity at vacuum seal state and non-vacuum state, can fill inhomogeneous clearance. Therefore, by selecting a vacuum compression plate with a reasonable thickness, a gap betweenbattery cell 50 and the inner wall can be filled, and after the vacuum state is released, the compression plate rebounds to support and restrainbattery cell 50.

(2) The initial restraint force ofbattery cell 50 can be controlled

The vacuum compression plate rebounds after releasing the vacuum state, and then can provide a certain restraining force for thebattery cell 50, and according to a compression stress strain curve of the compressed foam elastic material, different compression amounts can provide different supporting forces for the same material; different materials have different support forces for the same amount of compression. Therefore, the initial constraining force of the vacuum compression plate on thebattery cell 50 can be controlled by selecting the compression amount and material of the elastic material in the vacuum compression plate.

(3) Can limit the expansion of thebattery cell 50

Foam elastic material in the vacuum compression board is in by the compression state, can fill the clearance after the release vacuum state and have initial binding power toelectric core 50, and whenelectric core 50 took place the inflation, the foam elastic board can further be compressed, can lead to compressive stress to rise, rises to certain extent when compression elasticity, can offsetelectric core 50 bulging force, and then restrictselectric core 50 inflation.

(4) Simple structure and manufacturability

The vacuum compression plate is made of foam elastic material, vacuum compression packaging is carried out on the vacuum compression plate in a sealing bag, and the vacuum compression plate can play a role by shearing a sealing opening after being placed in place. Simple structure and manufacturability and low cost.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A battery pack, comprising:

the tray comprises a bottom plate and a plurality of boundary beams arranged on the periphery of the bottom plate, and the bottom plate and the boundary beams are enclosed to form an accommodating groove;

the battery cell is positioned in the accommodating groove, and an assembling gap is formed between the battery cell and the edge beam;

the buffer piece is arranged in the assembling gap, and the compression amount of the buffer piece is adjustable along the direction from the edge beam to the accommodating groove;

the buffer piece is switchable between a first state and a second state, the compression amount of the buffer piece is a first compression amount when the buffer piece is in the first state, the compression amount of the buffer piece is a second compression amount when the buffer piece is in the second state, and the first compression amount is larger than the second compression amount;

and the insulating support plate is arranged in the assembly gap and is positioned between the battery cell and the buffer piece.

2. The battery pack of claim 1, wherein the buffer comprises:

the packaging structure comprises a packaging layer, a containing space is limited in the packaging layer, the packaging layer is switched between a closed state and an open state, when the packaging layer is in the closed state, the pressure in the containing space is first pressure, when the packaging layer is in the open state, the pressure in the containing space is second pressure, and the first pressure is smaller than the second pressure;

the elastic body is arranged in the accommodating space, and the compression amount of the elastic body is adjustable along the direction from the edge beam to the accommodating groove.

3. The battery pack according to claim 2, wherein the elastic body defines a plurality of open holes communicating with the outside.

4. The battery pack of claim 3, wherein the elastomer is foam.

5. The battery pack of claim 2, wherein the receiving groove has an open end, and the encapsulation layer has an opening proximate the open end of the receiving groove when the encapsulation layer is in the open state.

6. The battery pack of claim 2, wherein the first pressure is a vacuum pressure and the second pressure is an atmospheric pressure.

7. The battery pack according to claim 1, wherein at least one side of the insulating support plate is coated with an adhesive.

8. The battery pack of claim 1, wherein the bumper is coupled to the side beam.

9. The battery pack of claim 1, wherein the buffer member is a plate-shaped member, and a thickness direction of the buffer member is along a direction from the edge beam toward the receiving groove.

10. The battery pack of claim 1, wherein the cell has a first outer side and a second outer side, the first outer side has an area smaller than an area of the second outer side, the first outer side is connected to the base plate, and the second outer side abuts against the insulating support plate.

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